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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Voltammetric Detection of Ammonium Ion Using Self-assembled Monolayers Modified with Ionophoric Receptors

2014년 8월 28일 13시 57분 08초
ELEC.P-1224 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
노성민, 조승기, 신재호1, 차근식1, 김홍석2, 남학현1, 심준호*
대구대학교 화학·응용화학과, Korea
1광운대학교 화학과, Korea
2경북대학교 응용화학과, Korea
Thiazole benzo-crown ether ethylamine-thioctic acid (TBCEAT) was evaluated as an ammonium (NH4+) ionophore for the preparation of ion-channel sensors (ICSs) based on self-assembled monolayers (SAMs) on a gold electrode. A SAM film based on TBCEAT on a gold electrode was assessed as a NH4+-selective sensor, particularly the voltammetric response. The working principle of this voltammetric sensor conceptually mimicked that of the ligand gated ion-channel proteins with regard to the chemically stimulated changes in the membrane permeability. The response to various analytes is based on the change in the electron transfer rates of a redox reaction of the reporter ion [Ru(NH3)6]3+/2+ before and after the binding of NH4+ to TBCEAT on the electrode surface, where electrostatic repulsion between the NH4+-TBCEAT complex and [Ru(NH3)6]3+/2+ induced a decrease in the rate constant. The selective ion-recognition properties of TBCEAT were characterized fully in the conventional ion-selective electrode (ISE) configuration using plasticized polymeric membranes. The mixed monolayer formed with alkylthiol and TBCEAT could bind ammonium ion selectively, and effectively control the flux of the reporter ion [Ru(NH3)6]3+/2+, resulting in ammonium selective ICS with comparable performance (in terms of selectivity and detection limits) to conventional ISE.